静力触探技术在水平钻孔注浆效果评价中的应用

Static Sounding Technology Applied to Evaluation on Grouting Effect of Horizontal Drilling Hole

针对某市轨道交通地铁隧道工程水平钻孔注浆效果评价难的问题,运用静力触探技术,判断富水区域注浆前后的土体物理性质变化。检测结果发现,静力触探技术可获得试验区域注浆前后的比贯入阻力P_(s)值。注浆后,土体的P_(s)值出现不同程度的提高。不同土层注浆后,P_(s)值提高率大小排序:灰色淤泥质黏土>淤泥质粉质黏土>灰色黏土>粉质黏土>素填土。注浆后,地基承载力基本值f_(0)、不排水抗剪强度基本值C_(u)、压缩模量基本值E_(s)等土体物理参数,均有不同程度的提高。

According to a difficult problem of an evaluation on grouting effect of a horizontal drilling hole in an urban rail transportation subway tunnel project,a static sounding technology was applied to judge the variation of the soil physical properties before and after the grouting in the watery area.The detection results showed that the static sounding technology could be applied to get the specific penetration resistance P_(s) value before and after the grouting in the test area.After the grouting,the P_(s) value in the soil would be increased in a different degree.After the grouting in different soils,the increased rate of the P_(s) value would be a size order:the gray muddy clay>the muddy silty clay>the gray clay>the silty clay>the plain backfill.After the grouting,the basic value f_(0) of the foundation bearing capacity,the basic value C_(u) of the shear strength without water drainage,the basic value E_(s) of the compressive modulus and other soil physical parameters all would be increased in a different degree.